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Mine was doing the same. Navman advised me to hook up to the computer and access the unit in my computer,
find my documents on the navman and delete the logs. Worked for me. However now I have another problem and Navman don't know who to fix it.

once downloaded the F10 PC software, redownload your language voice to the F10 from the navdesk software you just installed on your pc.
Note: if the voice is already on the f10 and it's not working, try removing it then redownloading the voice again.
Once downloaded to the F10 select the required voice from the settings menu.
cheers.
c.ellis.

My Navman S50 has been working fine the other day it decided to show me the safety agreement when switched on then shows half the screen black with navman S50 printed in the black section the other half shows a picture of a pretty womans face looking backwards from a car window. I can get to the main menu and then takes me in a circle back to the safety agreement I've tried resetting by holding the on off switch down for 6 seconds when switching off the device is there any other way to reset my navman S50.